Abstract: The present invention relates to a process for linking two molecules by means of a Diels Alder reaction with inverse electron requirement (DARinv), comprising the following steps: reaction of a (a) triazine or tetrazine with one or more electron-attracting substituents on the ring as a diene component, the electron-attracting substituents being selected from: COOR C(O)NR2 CX3 (X=halogen) halogen CN SO2—R or SO3—R PR2 wherein R?H, alkyl, aryl, heterocycle, which in turn may be substituted, where appropriate, with alkyl, OH, SH, halogen, aryl, heterocycle, nitro, carboxyamido or amine group.

Abstract: The present invention relates to a process for linking two molecules by means of a Diels Alder reaction with inverse electron requirement (DARinv), comprising the following steps: reaction of a (a) triazine or tetrazine with one or more electron-attracting substituents on the ring as a diene component, the electron-attracting substituents being selected from: COOR C(O)NR2 CX3 (X=halogen) halogen CN SO2—R or SO3—R PR2 wherein R?H, alkyl, aryl, heterocycle, which in turn may be substituted, where appropriate, with alkyl, OH, SH, halogen, aryl, heterocycle, nitro, carboxyamido or amine group.

Abstract: The invention relates to a device for producing different hole patterns in sheet-shaped print materials. An apparatus and process for producing different hole patterns in a sheet-shaped print material is provided wherein a punch in a tool roller is raised and lowered relative to an outer surface of the tool roller in order to effectuate and ineffectuate, respectively, punching by the punch. According to a preferred embodiment, a die roller is provided having a die corresponding with the punch, and sheets are fed through the tool roller and the die roller. In one embodiment punches and dies are provided, and the punches are selectively raised and lowered in order to achieve a desired hole pattern in the sheet.

Abstract: The profiled surface is used as an abradable (1) in flow machines such as gas turbines where blade tips (2) move over the profiled abradable in a predetermined direction (v) to produce a partial abraded surface which is formed by material removal or ablation. The surface is formed by ribs (15) which surround chamber-like depressions (11) and extend in rib directions. The abradable (1) forms a pattern of strip-like elements (5) which lie in the directions of the ribs on connection lines (45) between corner points (41, 42; 43, 44) of a reference grid (40). Over at least more than 80-90% of the abraded surface the rib direction differs from the direction of movement (v) of the blade tips (2). For at least two-thirds of the abraded surface the direction of movement deviates from the rib direction by more than 30°, preferably more than 45°. The strip-like elements (5) of the abraded surface can be curved as well as discrete and/or partly connected strips.